Transistor Bjt Switch

The bjt as switch review. The bipolar junction transistor or simply bjt is a three layer three terminal and two junction semiconductor device.

Consider The Circuit Below With A 2n3904 Si Bjt Tr

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Transistor bjt switch. Bjt bipolar junction transistor are widely used an amplifier oscillator switch etc. Transistor as a switch when used as an ac signal amplifier the transistors base biasing voltage is applied in such a way that it always operates within its active region that is the linear part of the output characteristics curves are used. The controlling current goes between emitter and base.

When the transistor is connected to ground that means the load is between v and the transistor. The switched controlled current goes between emitter and collector. Almost in many of the applications these transistors are used for two basic functions such as switching and amplification.

Transistor as a switch if the circuit uses the bjt transistor as a switch then the biasing of the transistor either npn or pnp is arranged to operate the transistor at the both sides of the i v characteristics curves shown below. A simple explanation of a transistor as a switch. When a transistor has zero current through it it is said to be in a state of cutoff fully nonconducting.

Transistor as a switch or bipolar junction transistor or bjt as switch a switch offers open circuit infinite resistance when it is put in off position and offers short circuit zero resistance when it is put in on position. A transistor can be operated in three modes active region saturation region and cut off region. Typically these use an npn bjt or an n channel mosfet.

Since the transistor is switching the path to ground or is sitting on the low side of the load it is called a low side switch. Transistors may be used as switching elements to control dc power to a load. It is a current driven device mosfet is voltage driven the output current is equal to the input current times a factor which is called gain.

Understand the working principle of a transistor as a switch and the theory behind how it works.

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